Reconciliation of Benefit Obligation Plan Assets and Funded Status of Pension and Postretirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Pension Benefits, Domestic
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 308.6	[1]	$ 314.4
Acquisitions	374.9
Interest cost	14.3		14.6		$ 13.3
Curtailments and settlements	(18.8)		(25.2)
Actuarial loss (gain)	(16.3)		24.2
Benefits paid	(22.7)		(19.4)
Benefit obligation at end of year	640.0	[1]	308.6	[1]	314.4
Fair value of plan assets at beginning of year	268.5		270.0
Acquisitions	292.5
Actual return (loss) on plan assets	(14.2)		27.6
Company contributions	12.2		15.5
Settlements	(18.8)		(25.2)
Benefits paid	(22.7)		(19.4)
Fair value of plan assets at end of year	517.5		268.5		270.0
Net (liability) recognized in the consolidated balance sheet	$ (122.5)		$ (40.1)
Discount rate	4.44%		3.90%
Pension Benefits, Foreign
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 74.1	[1]	$ 71.0
Service cost	2.3		2.1		2.2
Interest cost	1.5		2.4		2.3
Curtailments and settlements	(1.7)		(0.9)
Amendments			(1.1)
Actuarial loss (gain)	(4.8)		12.6
Benefits paid	(2.3)		(3.1)
Foreign currency translation and other	(6.8)		(8.9)
Benefit obligation at end of year	62.3	[1]	74.1	[1]	71.0
Fair value of plan assets at beginning of year	35.0		35.7
Actual return (loss) on plan assets	0.5		3.0
Company contributions	4.2		3.7
Settlements	(1.7)		(0.9)
Benefits paid	(2.3)		(3.1)
Foreign currency translation and other	(3.2)		(3.4)
Fair value of plan assets at end of year	32.5		35.0		35.7
Net (liability) recognized in the consolidated balance sheet	$ (29.8)		$ (39.1)
Discount rate	2.56%		2.23%
Rate of compensation increase	2.49%		2.44%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 382.7	[1]	$ 385.4
Acquisitions	374.9
Service cost	2.3		2.1		2.2
Interest cost	15.8		17.0		15.6
Curtailments and settlements	(20.5)		(26.1)
Amendments			(1.1)
Actuarial loss (gain)	(21.1)		36.8
Benefits paid	(25.0)		(22.5)
Foreign currency translation and other	(6.8)		(8.9)
Benefit obligation at end of year	702.3	[1]	382.7	[1]	385.4
Fair value of plan assets at beginning of year	303.5		305.7
Acquisitions	292.5
Actual return (loss) on plan assets	(13.7)		30.6
Company contributions	16.4		19.2
Settlements	(20.5)		(26.1)
Benefits paid	(25.0)		(22.5)
Foreign currency translation and other	(3.2)		(3.4)
Fair value of plan assets at end of year	550.0		303.5		305.7
Net (liability) recognized in the consolidated balance sheet	$ (152.3)		$ (79.2)
Discount rate	4.27%		3.58%
Rate of compensation increase	2.49%		2.44%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 6.8	[1]	$ 6.4
Acquisitions	0.7
Interest cost	0.3		0.3		0.3
Actuarial loss (gain)	(0.5)		0.3
Participant contributions	0.2		0.2
Benefits paid	(0.5)		(0.4)
Benefit obligation at end of year	7.0	[1]	6.8	[1]	$ 6.4
Company contributions	0.3		0.2
Participant contributions	0.2		0.2
Benefits paid	(0.5)		(0.4)
Net (liability) recognized in the consolidated balance sheet	$ (7.0)		$ (6.8)
Discount rate	4.30%		3.90%
Healthcare cost trend rate, Current	6.71%		6.45%
Healthcare cost trend rate, Ultimate	4.50%		4.50%

[1] The accumulated benefit obligation for all defined benefit pension plans was $690 and $376 at December 31, 2015 and 2014, respectively.